Hella 009166981 Oxygen Sensor

Overview

Hella 009166981 is a specific-fit oxygen sensor built as a standard replacement for vehicles that use a 4-wire, heated narrow-band regulating sensor. It uses an M18 x 1.5 threaded mount, a rectangular female connector, and a 570 mm harness for applications before the catalytic converter.

This oxygen sensor helps maintain accurate air-fuel feedback for smoother engine operation, improved fuel control, and reduced emissions. It is a direct-fit option for a wide range of Audi and Volkswagen applications, including Audi A4, Audi Q5, and Volkswagen Passat fitments.

Key Features

• Specific-fit oxygen sensor for targeted applications
• Heated narrow-band design for regulating air-fuel data
• 4-wire layout with 4-pin rectangular female connector
• M18 x 1.5 threaded mounting style
• 570 mm harness length for listed fitments
• Standard replacement grade for before-catalytic-converter locations

Detailed Description

Hella 009166981 is engineered as a regulating oxygen sensor for exhaust systems before the catalytic converter. Its heated narrow-band design and 4-pin configuration support precise feedback to the engine management system, which is critical for maintaining fuel delivery and emissions control. The threaded M18 x 1.5 body and 570 mm cable length match the listed applications, including Audi A4, Audi A5, Audi Q5, Volkswagen Touareg, and Volkswagen Passat.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

For buyers searching for an Audi A4 oxygen sensor, Volkswagen Passat oxygen sensor, or a Hella 009166981 replacement, this part is listed across multiple model years and positions. Confirm the exact fitment row against your vehicle’s year, model, and sensor location before ordering.

What It Helps Address

• Incorrect air-fuel ratio readings
• Check engine lights related to oxygen sensor performance
• Reduced fuel efficiency caused by faulty sensor feedback
• Higher exhaust emissions from inaccurate mixture control
• Rough engine operation tied to poor sensor response

Installation Notes

Install only on the exact vehicle and position listed in the fitment table. This sensor uses a threaded mount and a 4-pin connector, so connector style and harness length should be matched before installation. Some applications are listed with specific cylinder or color notes; verify those details against the original sensor before replacement.

Quality Assurance

Hella supplies OE-grade replacement components, and this oxygen sensor is built to meet the demands of standard replacement service. Part number 009166981 is designed for consistent signal output and dependable operation in the listed applications.